{"product_id":"organic-liquid-potassium-fertiliser","title":"Organic Potassium Fertiliser | Liquid Potash Feed 15% K₂O","description":"\u003c!-- Dr Forest — Organic Liquid Potassium Fertiliser 15% K2O --\u003e\n\u003c!-- Prefix: drf-lk- | Design System v1.0 | 4-tab --\u003e\n\u003c!-- Pure CSS radio tabs. No JavaScript. Shopify-safe. --\u003e\n\u003c!-- REV 2026-08-01: chloride-free claims REMOVED pending supplier substantiation. --\u003e\n\u003c!-- Cardarelli \/ Xu 2024 \/ Wang 2023 paragraph removed. Compliance sweep applied. --\u003e\n\u003cstyle\u003e\n  .drf-wrap *, .drf-wrap *::before, .drf-wrap *::after { box-sizing: border-box; margin: 0; padding: 0; }\n  .drf-wrap { font-family: 'Jost', sans-serif; font-weight: 400; color: #3A4A40; font-size: 14px; line-height: 1.65; width: 100%; max-width: 100%; overflow: hidden; }\n  :root {\n    --drf-grn:        #1B3D2F;\n    --drf-grn-light:  #E8F0EB;\n    --drf-grn-mid:    #4a7a5e;\n    --drf-grn-dark:   #0F2A1F;\n    --drf-gold:       #C5A55A;\n    --drf-gold-light: #FAF7F0;\n    --drf-cream:      #F5F2EC;\n    --drf-border:     #d4cfc5;\n    --drf-muted:      #3A4A40;\n    --drf-white:      #FFFFFF;\n  }\n  .drf-wrap h2 { font-family: 'Cormorant Garamond', serif; font-weight: 400; font-size: 1.9em; color: var(--drf-grn); line-height: 1.25; margin-bottom: 0.5em; letter-spacing: -0.3px; }\n  .drf-wrap h3 { font-family: 'Cormorant Garamond', serif; font-weight: 400; font-size: 1.35em; color: var(--drf-grn); margin: 1.4em 0 0.4em; }\n  .drf-wrap h4 { font-family: 'Jost', sans-serif; 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justify-content: center; }\n  .drf-steps li:last-child { border-bottom: none; }\n\n  \/* USE CASES *\/\n  .drf-uses { list-style: none; padding: 0; }\n  .drf-uses li { padding: 0.6em 0; border-bottom: 1px solid var(--drf-gold); }\n  .drf-uses li:nth-child(even) { border-bottom-color: var(--drf-grn); }\n  .drf-uses li:last-child { border-bottom: none; }\n  .drf-uses li strong { color: var(--drf-grn); }\n\n  \/* COMPARISON *\/\n  .drf-compare { margin: 1.2em 0; }\n  .drf-compare-box { border: 1px solid var(--drf-border); padding: 1em 1.2em; margin-bottom: 0.8em; background: var(--drf-grn-light); }\n  .drf-compare-box h4 { margin-top: 0; color: var(--drf-grn); text-transform: none; letter-spacing: 0; font-size: 1.05em; font-family: 'Cormorant Garamond', serif; font-weight: 400; border-bottom: 1px solid var(--drf-gold); padding-bottom: 0.4em; margin-bottom: 0.6em; }\n\n  \/* TABLES *\/\n  .drf-wrap table { width: 100%; border-collapse: collapse; margin: 1.2em 0; font-size: 0.92em; }\n  .drf-wrap table th { background: var(--drf-grn); 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font-size: 0.92em; line-height: 1.7; }\n  .drf-faq-a \u003e div { padding: 0 0 1em; }\n  .drf-faq input:checked ~ .drf-faq-q::after { content: '\\2212'; background: var(--drf-grn); color: #fff; border-color: var(--drf-grn); }\n  .drf-faq input:checked ~ .drf-faq-a { max-height: 900px; }\n\n  \/* REFS + RULE *\/\n  .drf-refs { font-size: 0.78em; color: var(--drf-muted); line-height: 1.5; margin-top: 1.5em; padding-top: 0.8em; border-top: 1px solid var(--drf-border); }\n  .drf-refs ol { padding-left: 1.4em; margin: 0; }\n  .drf-refs li { margin-bottom: 0.3em; }\n  .drf-sep { border: none; border-top: 1px solid var(--drf-gold); width: 200px; margin: 1.8em auto; }\n\u003c\/style\u003e\n\u003cdiv class=\"drf-wrap\"\u003e\n\u003cdiv class=\"drf-tabs-wrap\"\u003e\n\u003cinput checked id=\"drf-lk-tab1\" name=\"drf-lk-tabset\" type=\"radio\"\u003e \u003cinput id=\"drf-lk-tab2\" name=\"drf-lk-tabset\" type=\"radio\"\u003e \u003cinput id=\"drf-lk-tab3\" name=\"drf-lk-tabset\" type=\"radio\"\u003e \u003cinput id=\"drf-lk-tab4\" name=\"drf-lk-tabset\" type=\"radio\"\u003e\n\u003cdiv class=\"drf-tab-labels\"\u003e\n\u003clabel for=\"drf-lk-tab1\"\u003eOverview\u003c\/label\u003e \u003clabel for=\"drf-lk-tab2\"\u003eThe Science\u003c\/label\u003e \u003clabel for=\"drf-lk-tab3\"\u003eHow to Use\u003c\/label\u003e \u003clabel for=\"drf-lk-tab4\"\u003eFAQ\u003c\/label\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-panels\"\u003e\n\u003cdiv id=\"drf-lk-panel1\" class=\"drf-panel\"\u003e\n\u003ch2\u003eOrganic liquid potassium fertiliser: 15% K₂O, fully in solution\u003c\/h2\u003e\n\u003cdiv class=\"drf-badge-row\"\u003e\n\u003cspan class=\"drf-badge drf-badge-green\"\u003e15% K₂O\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003e27% organic matter\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003e100% in solution\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003eDirect uptake\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-gold\"\u003eSingle nutrient\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-gold\"\u003eFoliar or root\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eLiquid potassium fertiliser\u003c\/strong\u003e is a concentrated potash feed that delivers 15% K₂O already dissolved in solution, so the potassium is available to the plant the moment it reaches the root or the leaf. Potassium is the nutrient that moves sugars out of the leaf and into fruit, and it governs how a plant manages water under heat and drought. It is plant-derived rather than mined, with the feedstock drawn partly from agricultural residual streams.\u003c\/p\u003e\n\u003cp\u003eIt behaves nothing like a mineral suspension. There is no settling, no shaking, and no grit to clog a sprayer nozzle or a dosing line. The potassium is genuinely dissociated in solution, held alongside 27% organic matter that carries plant-derived carbon into the root zone with every dose. That figure is high enough to mean something for soil biology and low enough that it will not block an irrigation system.\u003c\/p\u003e\n\u003cp\u003eThis is a single-nutrient feed. It carries no nitrogen and no phosphorus, so you control potassium independently of everything else in the programme, which is exactly what a fruiting crop needs in its second half.\u003c\/p\u003e\n\u003cdiv class=\"drf-stats\"\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e15%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003ePotassium (K₂O)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e27%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eOrganic matter\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e5 – 6\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003epH\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e1.20 – 1.30\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eDensity kg\/l\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWhat to use liquid potash for\u003c\/h3\u003e\n\u003cul class=\"drf-uses\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eTomatoes, peppers, chillies and aubergines from first fruit set.\u003c\/strong\u003e Potassium demand climbs sharply once fruit starts filling. This is the classic high-potash tomato feed application, and the point in the season where a dedicated potassium source earns its place\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrawberries, raspberries, currants and top fruit during fruit development.\u003c\/strong\u003e Potassium drives the movement of sugars from leaf to fruit. Berry crops respond in soluble solids and in the sugar-to-acid balance that determines how a fruit actually tastes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePotatoes from flowering through to lifting.\u003c\/strong\u003e One of the highest potassium-demanding crops in the vegetable garden. Apply from first bloom onwards\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoses, dahlias and herbaceous borders in late season.\u003c\/strong\u003e Potassium stiffens stems and supports repeat flowering. Useful through the second half of the growing season when nitrogen should be tapering off\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrecting visible potassium deficiency.\u003c\/strong\u003e Scorched, browning leaf margins on older leaves, working inward from the edge. A foliar application is the fastest route to correcting it\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat and drought resilience.\u003c\/strong\u003e Potassium regulates stomatal opening, which is how a plant controls water loss. Plants short of potassium wilt sooner and recover more slowly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrip lines and dosing systems.\u003c\/strong\u003e Fully in solution with no settling, so it feeds through irrigation equipment without the clogging a mineral suspension causes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eLiquid potash compared with the alternatives\u003c\/h3\u003e\n\u003cdiv class=\"drf-compare\"\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003eLiquid potassium 15% K₂O\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003ePotassium fully in solution, taken up on contact with no dissolution lag\u003c\/li\u003e\n\u003cli\u003e27% organic matter carries plant-derived carbon into the root zone\u003c\/li\u003e\n\u003cli\u003eWorks as a root drench or a foliar spray from the same bottle\u003c\/li\u003e\n\u003cli\u003ePlant-derived rather than mined, partly from agricultural residual streams\u003c\/li\u003e\n\u003cli\u003eNo settling, so it runs clean through a sprayer, a dosing pump or a watering can\u003c\/li\u003e\n\u003cli\u003eSingle nutrient, so potassium is controlled independently of N and P\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003eSulphate of potash (SOP)\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eA sound mineral choice, and genuinely chloride-free\u003c\/li\u003e\n\u003cli\u003eDry crystalline salt, so it needs dissolving and dissolves slowly in cold water\u003c\/li\u003e\n\u003cli\u003eSupplies sulphur alongside potassium, which is often useful\u003c\/li\u003e\n\u003cli\u003eNo organic matter and no carbon contribution\u003c\/li\u003e\n\u003cli\u003eMined or manufactured rather than plant-derived\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003eMuriate of potash (KCl)\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eThe cheapest source of potassium per kilogram, which is why it is so widely used\u003c\/li\u003e\n\u003cli\u003eRoughly 47% chloride by weight, which accumulates in containers and grow bags\u003c\/li\u003e\n\u003cli\u003eNo organic matter, no carbon contribution to soil biology\u003c\/li\u003e\n\u003cli\u003eAdequate in open ground on chloride-tolerant crops\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eNitrogen is deliberately absent\u003c\/span\u003e\n\u003cp\u003eThis is a single-nutrient feed. It carries no nitrogen and no phosphorus, which is exactly what you want in the second half of a fruiting crop, because late nitrogen pushes leaf at the expense of fruit. Run it alongside a balanced base feed early in the season, then lean on it as the crop fills.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003eMade with organic ingredients. \u003cem\u003eMade by Growers. Backed by Science.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"drf-lk-panel2\" class=\"drf-panel\"\u003e\n\u003ch2\u003eThe science of potassium in plants\u003c\/h2\u003e\n\u003cp\u003ePotassium is the odd one out among the major nutrients. Nitrogen ends up in protein, phosphorus in DNA and membranes, calcium in cell walls. Potassium is built into almost nothing. It stays as a free ion in solution inside the plant, and it is the most abundant cation in plant tissue, which tells you its job is regulatory rather than structural (Marschner, 2012).\u003c\/p\u003e\n\u003cp class=\"drf-pullquote\"\u003ePotassium is not what the plant is made of. It is how the plant runs itself.\u003c\/p\u003e\n\u003ch3\u003eWhat potassium actually does\u003c\/h3\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e01\u003c\/span\u003e\n\u003ch4\u003eStomatal regulation and water use\u003c\/h4\u003e\n\u003cp\u003eGuard cells open and close by pumping potassium in and out, which changes their turgor. A plant short of potassium loses fine control over its stomata, wastes water on hot days and shuts down photosynthesis sooner under drought stress (Hasanuzzaman et al., 2018).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e02\u003c\/span\u003e\n\u003ch4\u003ePhloem loading, moving sugar to fruit\u003c\/h4\u003e\n\u003cp\u003eSucrose transport from leaf to sink tissue is driven by a proton gradient that depends on potassium. This is the direct mechanistic link between potassium supply and fruit sugar content, and it is why potash feeds change how fruit tastes rather than only how large it grows (Zörb et al., 2014).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e03\u003c\/span\u003e\n\u003ch4\u003eEnzyme activation\u003c\/h4\u003e\n\u003cp\u003eMore than sixty plant enzymes require potassium as an activator, including those in starch synthesis and nitrogen assimilation (Marschner, 2012). Potassium shortage therefore reduces the plant's ability to use the nitrogen it has already taken up.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e04\u003c\/span\u003e\n\u003ch4\u003eOsmotic adjustment under stress\u003c\/h4\u003e\n\u003cp\u003ePotassium accumulation in the vacuole lowers cell water potential, letting roots keep drawing water from drying soil. Well-supplied plants hold turgor longer into a dry spell.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e05\u003c\/span\u003e\n\u003ch4\u003eStem strength and lodging resistance\u003c\/h4\u003e\n\u003cp\u003ePotassium supports lignification and cell wall thickening in stem tissue. Deficient plants are visibly floppier and lodge more readily.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003chr class=\"drf-sep\"\u003e\n\u003ch3\u003eSolution versus suspension\u003c\/h3\u003e\n\u003cp\u003eA great deal of what is sold as liquid fertiliser is a suspension: solid mineral particles held in water. Those products settle, need agitating, and have to dissolve in the soil before a root can take anything up. This feed is a true solution. The potassium is already dissociated as K⁺, which is the only form a root hair or a leaf cuticle can absorb. There is no dissolution step to wait for.\u003c\/p\u003e\n\u003cp\u003eThat is what makes the same bottle work as a foliar spray. Foliar uptake happens through cuticular pores measured in nanometres. A suspended particle cannot pass, but an ion in solution can. It is also why it runs through drip lines and dosing equipment without blocking them.\u003c\/p\u003e\n\u003ch3\u003ePotassium and magnesium compete\u003c\/h3\u003e\n\u003cp\u003ePotassium, magnesium and calcium are all taken up as cations and they compete for the same root uptake sites. Sustained heavy potash feeding can therefore induce magnesium deficiency even where soil magnesium is adequate, showing as interveinal yellowing on older leaves. This is the single most common self-inflicted problem in a long high-potash tomato season, and the reason a calcium and magnesium source belongs in the programme alongside a potash feed rather than after it.\u003c\/p\u003e\n\u003ch3\u003eChloride and the source of your potash\u003c\/h3\u003e\n\u003cp\u003eChloride is a micronutrient, so plants need a little. The problem is dose. Muriate of potash is close to half chloride by weight, so a season of potash feeding in a container can deliver chloride well beyond the micronutrient requirement. Chloride is highly mobile and osmotically active, so it raises the salt load of the root zone and competes with nitrate uptake at the root surface (Xu et al., 2000). In open ground on free-draining soil, winter rainfall flushes it out. In a grow bag or a 10-litre pot, it does not. Tomatoes, strawberries, potatoes and beans are the crops where chloride sensitivity shows earliest, which is unfortunate, because those are also the crops gardeners feed the most potash to. It is worth knowing which potassium source you are actually using.\u003c\/p\u003e\n\u003chr class=\"drf-sep\"\u003e\n\u003ch3\u003ePlant-derived rather than mined\u003c\/h3\u003e\n\u003cp\u003eThe potassium here is plant-derived, with the feedstock drawn partly from agricultural residual streams. Conventional potash is mined, refined and freighted a long way before it reaches a British garden. Plant-based nutrient sources avoid that entirely, and the literature on bio-based fertilisers describes them as a credible route to reducing the extraction footprint of fertiliser production (Chojnacka et al., 2020).\u003c\/p\u003e\n\u003cp\u003eOne honest consequence: because the feedstock is natural plant material, the nutrient content varies slightly between batches. The 15% figure is the specification, not a laboratory constant.\u003c\/p\u003e\n\u003cdiv class=\"drf-refs\"\u003e\n\u003ch4\u003eReferences\u003c\/h4\u003e\n\u003col\u003e\n\u003cli\u003eMarschner, P. (ed.) (2012). \u003cem\u003eMarschner's Mineral Nutrition of Higher Plants\u003c\/em\u003e, 3rd edition. Academic Press.\u003c\/li\u003e\n\u003cli\u003eHasanuzzaman, M. et al. (2018). Potassium: a vital regulator of plant responses and tolerance to abiotic stresses. \u003cem\u003eAgronomy\u003c\/em\u003e, 8(3), 31.\u003c\/li\u003e\n\u003cli\u003eZörb, C., Senbayram, M. \u0026amp; Peiter, E. (2014). Potassium in agriculture: status and perspectives. \u003cem\u003eJournal of Plant Physiology\u003c\/em\u003e, 171(9), 656–669.\u003c\/li\u003e\n\u003cli\u003eXu, G., Magen, H., Tarchitzky, J. \u0026amp; Kafkafi, U. (2000). Advances in chloride nutrition of plants. \u003cem\u003eAdvances in Agronomy\u003c\/em\u003e, 68, 97–150.\u003c\/li\u003e\n\u003cli\u003eChojnacka, K. et al. (2020). Bio-based fertilizers: a practical approach towards circular economy. \u003cem\u003eBioresource Technology\u003c\/em\u003e, 295, 122223.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"drf-lk-panel3\" class=\"drf-panel\"\u003e\n\u003ch2\u003eHow to use liquid potassium fertiliser\u003c\/h2\u003e\n\u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eBefore you start\u003c\/span\u003e\n\u003cp\u003eShake gently and measure with a syringe or a small measuring cup, because at these dilutions a splash from the bottle is a long way off the mark. The feed is acidic at pH 5 to 6, which is normal and helps keep the potassium mobile. Always mix into water and never apply neat to soil or foliage. Before a first foliar application, spray two or three leaves and leave them 24 hours to check the plant is happy with the rate.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eApplication rates\u003c\/h3\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eRoot drench, main season feeding\u003c\/h4\u003e\n\u003cp class=\"drf-rate-meta\"\u003e\u003cstrong\u003eRate\u003c\/strong\u003e 1 – 2 ml per litre of water  |  \u003cstrong\u003eFrequency\u003c\/strong\u003e weekly through the fruiting period\u003c\/p\u003e\n\u003cp\u003eDelivers roughly 180 to 390 mg\/l of K₂O, a proper high-potash feeding concentration comparable to a commercial tomato feed. Use the lower end for general border and container feeding, the upper end for heavy fruiting crops from first fruit set onwards.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eFoliar spray, fast correction\u003c\/h4\u003e\n\u003cp class=\"drf-rate-meta\"\u003e\u003cstrong\u003eRate\u003c\/strong\u003e 2.5 – 3 ml per litre of water  |  \u003cstrong\u003eFrequency\u003c\/strong\u003e 3 – 4 applications per season\u003c\/p\u003e\n\u003cp\u003eSpray to run-off in the early morning or evening, never in strong sun. The fastest route to correcting visible potassium deficiency, and useful as a top-up when roots are struggling in cold or waterlogged soil.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eLight maintenance feed\u003c\/h4\u003e\n\u003cp class=\"drf-rate-meta\"\u003e\u003cstrong\u003eRate\u003c\/strong\u003e 0.5 – 1 ml per litre of water  |  \u003cstrong\u003eFrequency\u003c\/strong\u003e every watering\u003c\/p\u003e\n\u003cp\u003eFor established perennials, shrubs and anything already on a balanced base feed that needs only a potassium top-up rather than a full high-potash programme.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eMixing\u003c\/h3\u003e\n\u003col class=\"drf-steps\"\u003e\n\u003cli\u003eHalf-fill the watering can or sprayer with water first. Never add the concentrate to an empty container.\u003c\/li\u003e\n\u003cli\u003eMeasure the dose with a syringe or measuring cup and add it to the water.\u003c\/li\u003e\n\u003cli\u003eTop up to the full volume and stir or agitate briefly.\u003c\/li\u003e\n\u003cli\u003eApply the same day. Diluted feed is not worth keeping.\u003c\/li\u003e\n\u003cli\u003eRinse the sprayer through with clean water afterwards.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eWhen to apply through the season\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eCrop\u003c\/th\u003e\n\u003cth\u003eWhen to apply\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTomatoes, peppers, aubergines\u003c\/td\u003e\n\u003ctd\u003eAfter fruit set, then weekly through fruit development\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStrawberries and cane fruit\u003c\/td\u003e\n\u003ctd\u003eFrom flowering through fruit development\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePotatoes\u003c\/td\u003e\n\u003ctd\u003eFirst application at bloom, then through to lifting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTop fruit, apples, pears, plums\u003c\/td\u003e\n\u003ctd\u003eThrough fruit development, tapering off 4 weeks before harvest\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRoses and herbaceous borders\u003c\/td\u003e\n\u003ctd\u003eLate growth stage, from midsummer onwards\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrnamentals and container displays\u003c\/td\u003e\n\u003ctd\u003eLate growth stage, weekly to keep flowering going\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv class=\"drf-callout\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eDo not overdo it\u003c\/span\u003e\n\u003cp\u003ePotassium competes with magnesium and calcium for uptake at the root. Heavy, sustained potash feeding can induce magnesium deficiency, seen as interveinal yellowing on older leaves, even where soil magnesium is adequate. If you are feeding hard with potash through a long tomato season, keep an eye on the lower leaves and run a magnesium or calcium source alongside.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eStorage\u003c\/h3\u003e\n\u003cp\u003eKeep the cap tight. Store somewhere dark and dry between 10 and 25 °C. Shelf life is 18 months to 2 years from bottling. Do not let it freeze.\u003c\/p\u003e\n\u003ch3\u003eWhat to pair it with\u003c\/h3\u003e\n\u003cp\u003ePair this with the rest of the Dr Forest liquid range. \u003cstrong\u003eLiquid Gypsum\u003c\/strong\u003e supplies the calcium and sulphur that most liquid feeds leave out, and is the natural partner here given how hard potassium competes with calcium at the root. \u003cstrong\u003eLiquid Seaweed Biostimulant\u003c\/strong\u003e covers alginates and natural growth promoters that a straight nutrient feed does not. \u003cstrong\u003eMicro 7 chelated micronutrients\u003c\/strong\u003e fills the trace element gap on long cropping runs. For a full-season plan, see the \u003ca href=\"\/pages\/instructions\"\u003eDr Forest feeding programme\u003c\/a\u003e.\u003c\/p\u003e\n\u003c!-- TODO Joe: add one internal blog link here per the skill checklist (\u003e=1 product link and \u003e=1 blog link). --\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"drf-lk-panel4\" class=\"drf-panel\"\u003e\n\u003ch2\u003eLiquid potassium fertiliser: common questions\u003c\/h2\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-lk-faq1\" type=\"checkbox\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-lk-faq1\"\u003eWhat is liquid potassium fertiliser and what does it do?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eIt is a concentrated potash feed supplying 15% K₂O fully dissolved in solution. Potassium regulates water movement through the plant, activates enzymes and drives the transport of sugars from leaf into fruit. In practical terms it is what makes fruit fill and taste of something, and what keeps a plant standing up in hot weather.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-lk-faq2\" type=\"checkbox\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-lk-faq2\"\u003eHow is this different from ordinary tomato feed?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eMost tomato feeds are a balanced NPK with the potassium raised. This is a single nutrient at high concentration with no nitrogen or phosphorus, so you control the potassium independently of everything else. That matters most in the second half of a fruiting crop, when more nitrogen is the last thing you want.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-lk-faq3\" type=\"checkbox\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-lk-faq3\"\u003eWhat does \"100% in solution\" actually mean?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eThe potassium is dissociated in water as K⁺ rather than suspended as solid particles. A root hair or a leaf cuticle can only absorb the ion, so a suspension has to dissolve in the soil first before anything happens. Nothing settles in the bottle, nothing needs agitating, and nothing blocks a sprayer nozzle or a drip line.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-lk-faq4\" type=\"checkbox\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-lk-faq4\"\u003eCan I use it as a foliar spray?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eYes. The potassium is in true solution rather than suspension, so it passes through the leaf cuticle. Use 2.5 to 3 ml per litre, spray to run-off, and do it early morning or evening rather than in strong midday sun. Patch-test a few leaves before the first full application.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-lk-faq5\" type=\"checkbox\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-lk-faq5\"\u003eHow quickly will I see a result?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eA foliar application on a visibly deficient plant usually shows within a week. New growth comes through clean and the scorched margins stop advancing. Fruit quality effects build over the fruiting period rather than appearing overnight.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-lk-faq6\" type=\"checkbox\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-lk-faq6\"\u003eCan I use it through a drip line or irrigation system?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eYes, and it is one of the better feeds for it. The organic matter content is low enough that it will not clog emitters, and because nothing is held in suspension there is no sediment to settle out in the lines. Flush through with clean water at the end of a feeding run.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-lk-faq7\" type=\"checkbox\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-lk-faq7\"\u003eCan I mix it with other Dr Forest liquids?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eIt mixes well with seaweed and with the other liquid nutrient feeds. Do a small patch test first if you are combining three or more products. Avoid mixing it in the same can as a strongly alkaline product.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-lk-faq8\" type=\"checkbox\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-lk-faq8\"\u003eWill heavy potash feeding cause any other problems?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eIt can. Potassium competes with magnesium and calcium for uptake at the root, so a long hard potash programme can induce magnesium deficiency even in soil that has plenty. Watch for interveinal yellowing on the older, lower leaves, and run a calcium and magnesium source alongside rather than waiting for symptoms.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-lk-faq9\" type=\"checkbox\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-lk-faq9\"\u003eIs it safe around children, pets and wildlife?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eIt is a nutrient solution with no pesticide content. Treat it as you would any concentrated fertiliser: keep it capped, store it out of reach and wash hands after handling. Once diluted and watered in, the treated area is fine for children and pets.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-lk-faq10\" type=\"checkbox\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-lk-faq10\"\u003eIs this an organic fertiliser?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eIt is made with organic ingredients, and the potassium is plant-derived throughout. Dr Forest does not hold organic certification for its own products, so we describe them as made with organic ingredients rather than certified organic.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-lk-faq11\" type=\"checkbox\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-lk-faq11\"\u003eWhy does the label say the nutrient content may vary?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eBecause the feedstock is real plant material rather than a manufactured salt. The 15% K₂O is the formulation specification; natural variation in the plant feedstock means individual batches sit slightly either side of it.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-lk-faq12\" type=\"checkbox\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-lk-faq12\"\u003eWhat is the organic matter content for, and why is it light brown?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003e27% organic matter means each dose carries plant-derived carbon into the root zone alongside the potassium. A mineral salt solution delivers the nutrient and nothing else. It also means the solution is light brown rather than clear, and that colour is the organic fraction, not a fault.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-lk-faq13\" type=\"checkbox\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-lk-faq13\"\u003eHow long does it keep?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003e18 months to 2 years from bottling, stored dark and dry between 10 and 25 °C with the cap tight. Do not let it freeze.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Dr Forest","offers":[{"title":"500ml","offer_id":58307099689334,"sku":null,"price":13.99,"currency_code":"GBP","in_stock":true},{"title":"1 litre","offer_id":58307099722102,"sku":null,"price":21.99,"currency_code":"GBP","in_stock":true}],"url":"https:\/\/www.drforest.co.uk\/products\/organic-liquid-potassium-fertiliser","provider":"Dr Forest","version":"1.0","type":"link"}